Problems and solutions in the cultivation of the mushroom including: a) Mycelium fails to form Improper initiation strategy. Solutions : consult parameter of growth. Alter moisture, temperature, light, carbon dioxide, etc. Note : If the substrate is too moist, decrease moisture b) Chlorinated or contaminated water. Solutions : Use activated charcoal water filters to eliminate chemical contaminants or any other ways of simple or appropriate technology. c) Bad substrate. Solutions : Check substrate. Spread the substrate and remix the substrate, package again, make sure all raw materials are good and fresh. Note : It is necessary to pasteurize immediately after bagging otherwise fermentation gas will slow down the rate of growth of mycelium or stop mycelium growth. d) Bad pasteurization. Solutions : Check method of pasteurization. Release all air and make sure there is continuous steam before starting pasteurization for a period of 3h. e) The substrate in the bag is too hot when i